Take your sales price, minus selling costs, minus any capex, minus purchase price and that’s your taxable gain.

That's not the same as paying cash.According to a different post, your credit card debt costs you $600/month.

I know that interest on the acquisition loan can be included in the cost basis since it’s inventory.

In any case, successful wholesaling REQUIRES the knowledge, experience, and ability to accurately estimate repair and rehab costs and time.  

Inherently the steps are the same as if you were purchasing with financing save potentially less closing costs and ability to close sooner (if needed).The terms of your offer (ie -contingencies, closing cost splits etc) will determine what is different. 

Here are additional comments:1) Buying out of state removes any local knowledge you have from assisting in your success, including knowing areas, people and costs. - We always recommend buying your first rental locally if possible and DIY managing to learn as much as possible before investing OOS.2) Lots of crooks and incompetents in the PMC world:( They both cost you money.- As already stated, you'll have a small portfolio.

Do you work with any specialty tax firms to help us small business owners get access to R&D tax credits, cost segregation and other specialty tax credits?

While under contract, we perform due diligence and there will be some soft costs incurred. 

If rates dropped 1-2% on a $600,000 home, it would cost a buyer $3,400 a month.

@Yooni Choi managing from out of state (OOS) with ZERO previous landlord experience - probably won't go well.You WILL make a lot of mistakes that will cost you money.